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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39e286440a4c6252aa0899a9557c3021ac133e9bb19c6682942394fc946e8199' 
  AND token = '5K03PVIGZInN114VIHOnsdB7eJ/DJaqgCcFbehIvPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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