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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24047b9a078972929e6bc512692b21e5ba48197899db83e2592104ca88babcf1' 
  AND token = 'euD+n0d/tMbgsbkJEYFUjfhXywyEIqkM7uVVW/Rbqeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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