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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfb598891df1fa84c1f72f5198f883d6e057b4e1da5e21dd7f7b15b0ade499c4' 
  AND token = '00K0LojhD2Hceajy2uiCosLWYY8P0wOsibcQJ3RzKng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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