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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c18428f4ddae1b7c6f72174af2e35058c4d84dede2552c38e1a8c303d8b3cb0a' 
  AND token = 'jcp2ttpzu5ND7HYNmDvw9LdhHA6IPmhbcFNPXFtaMWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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