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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c9792811a5ddd7682401e23d21183d0fca2abe0c4e96b229408eb990206322e' 
  AND token = '8YrlK3x984Eb6xqk2sxDABeQT0mVbJqMWoKLXu2HQkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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