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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '700765e9bf8e5c03ace3fda7149f7e7cddc429995f503c73638b0ccf8a8aeda7' 
  AND token = 'ytoTd6ST7Z+4RWRI0ZD0wukqGs3921l3mZn4gdL/i8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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