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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0154f881d4c7112cc800be60d63049bb44d814c9017d6b74256d146a477c2655' 
  AND token = 'wuU/6bkK0cQhRpoAdEVz5LsuzsP/7jtwHrlUFEZmmTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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