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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffc186f90c144d5a6d2fca143040586dff498fcda3b45ceb42525951a0cdddef' 
  AND token = '+sgNC0Fpp6npdq+HRsARa0ugqx/4Gp582mtYBhFao1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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