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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5820bc1e102f2bccbd9e5a83f8cc54b781fe39a6a29f60d186f339f6956a6bc' 
  AND token = 'gITiTw7D5ZmnTan/d6cDLSil9ab7P+35GoM3sEwxXvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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