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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab37aa55ec2704dd4b2da72a2ff025bb2f45c8f09b77a40008a872e6aa61778d' 
  AND token = 'E1p3SLcCwYdSkSIVrIRkEtRo0LZ/X38Q26TqhMDFpa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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