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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b11543a25b25f26fb9a4cdfae12d08264ed0904dff3c3d6b234e3ccb39d52213' 
  AND token = 'TKqaqpdEOQ8kKkRJ4vzQ4NniZ9NMdoHig7gNbAxlt3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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