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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e23c8d6a3b41d505f8dbd70eb77fc7431c7f3529ebfc4620a51409f1801ecb71' 
  AND token = 'tkurcRj+IutaS1M6bx0Bddj5Wl9mQVgSSutacG26g0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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