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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f64ed8e1cbf2abf4583fcd96121a6aae45f2683f6800e3118a8046f251cacba' 
  AND token = 'ef1oSZBmJiSwrNlsxasQwY5OCjIXNSyOggR4/gMezcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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