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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e17ecdf2ee00855041e7ce6d24657e2752899e6ac8ecee30245716faba642eda' 
  AND token = 'S7k+x9zxmSzxik0Yf+F/7Evq6AKjOWPXAuP8h95SNYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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