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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ff5a1596fcd4fba7b95fd6a01bdd585f62e1d3525f567343abdd53db1013e9d' 
  AND token = 'ygIF49mF3pDDiPGeofDSq68h4g/psev+bZSxYdJwqls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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