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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8a975cebe413e691b07bdc27b3a54b9dc6af42ee5a19444cb6aa2e2bba0ae73' 
  AND token = 'Ftw4b6OtaiR5sQzlEtThyXXLUUC29TRwn27kPURCOMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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