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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bacbd10068cc751cd7b4f25aeb0decb56da8b1ce266dc363dccd06186f1a543' 
  AND token = 'lD+tdn4PdjKXMMRbvGjvV1rOOLA9jJIqkPlKbrZ6tXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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