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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5319626d8b3addaf99f9c52de9fb5d8aa6d6a10ba108b8616abd97354b89d0b4' 
  AND token = 'Ab7G8J3q4Ar8zC0t4rCst6zbvJ0crmG7YiVMqnfKlk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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