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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89d7bfdc5b3443842869c94ed35f940040ce7e603282dc1fff8d49c4403b7b1e' 
  AND token = 's+lF5p6ClsWkpo2emnTpzw1Zk4Vui0c/AtOEVlo3jPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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