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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cec80b4f8cb716f1313f7f2a87042d96bea89ebf95e9af5d43e7f3054cfee341' 
  AND token = '2xWnVO4Creo08JkN10xEUVjoU/6cUtrA1ARrvqS6UYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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