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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bc597c3390f9dc029112b24fb87b25d091771da7d8f862eb057b2a60e392eb2' 
  AND token = 'VWRQjyv7TYmTur3wLAuJMjbXXbJSidHYZ1RaQtEcCRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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