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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad89feae01f287d2c651e83dca2bfdbda6fa940d4472dd0b74c5138627676bc9' 
  AND token = 'a6y/EqXMHPajkvplrYHIwLVeOld5KaXIaWZJsjt59k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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