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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7306a3b694c48a0371807e30869554bc8f25dcff90b3b8fd92bebb55e6f473a5' 
  AND token = 'zIpYID0MRPzegDM6EGO3yVcgiS7luzq8Tzcy1+N4O7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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