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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '116b5501b2d5509f67d09c16739028225bc07a68b00e951b45103b52d93cf7c8' 
  AND token = 'Pf3qII8bi7csZOdWb5+iOxs1SLtk2GACKuKMO6pBYZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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