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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7174ccf3b0530d357b7ed44f6f914f99ba04b0d5dcec64a821dd50a1498c4ec' 
  AND token = 'CKOkBLMJFtRIeCtLkb7e0pgfh6ATi3MZRHW0MhjrRGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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