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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4098d11d9b078639ebeb03131aa89c594a69557de3cdde63aaf75a43bc6a81a2' 
  AND token = 'UrJkQ009KMOXDyzsL5HiRG3Sxi9wnPRxfsrbdc+mytc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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