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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '113f98aa8fb71cd0182c32801b6849f60c5b54dd09773a2474bccb4bc4ec2597' 
  AND token = 'Lh48E7TbQwaMNp+FMprwZo2HMHfwLFHpY1alLHo0qNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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