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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc4b148bf91ddf9d987735f26955cd149da4d0b181c566a05d1284ec0ddfe7db' 
  AND token = 'u9TaLTA8jlwDgmQbAkkQgEhqeEjFQDt8umpHmbSC/SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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