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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddf97befbe82dd5c74e3989cd9bb7300aca042dfea1cc131bb1641bdd5c4a671' 
  AND token = '9Hf7YPLgFuCHder3G6nzGZDB8Nj7hvDDVfAc0y/e/PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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