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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e89edcc462d2575b5a577c297ce9592ce82558e3e40fbef1387c4ee8bdd789c' 
  AND token = 's0de0phlDA//M72OKDkk7tNYEMdrLo8GZZ5C3/56vEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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