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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b22fa8838860ee1be8bf1ab266dae4d7f761490c83323203a9cd30f5f72c946' 
  AND token = 'u8PvdzqT130MUXWYOnQ+AlMoI1PxRSrpom7+usceRNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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