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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f79f1dd6c45cc54bb166cbea2c7a1b5c212e4d455ec291dedb9e0b2d8e0be79' 
  AND token = 'OmSMmDpT/02u2zO+vBF/6dLIg0qz23dMMCIHIJwaDGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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