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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd82df87dc172df3637bcafa3512cd851202a70e0db32c736208b0ba6b7939d4e' 
  AND token = '+2nyGJCg1HS2Mge7HqEL+Enxzl5pBW8UtyV5s8Zcxwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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