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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f7001717764da22121b06a490fbaafc8fda5ee9cacfe86732b89a991fd8ba9b' 
  AND token = 'Kan+laEEAhhDFh3r88zh01EBDncWxEK6YhOzq3sNarw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}