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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcd5f69400e7ac0b5339667973d0b8ba1336c99b0ca937fb20637c8cd4b3330b' 
  AND token = 'z6SJmhpGSfP8urIUX5jiCITaC3F+vuKmzaXeuF6mB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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