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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4796f74a7859b3c01f0423949b8752420f5a3685dd48731c8ac708c86310e4fb' 
  AND token = 'eF6DfOWhk5+LRppswEYYlam29rChpNKtzP49rnOA5hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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