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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd6f6420fd51236fa503b36f239e9b58c535c12f1af06759ec118df5e2a79832' 
  AND token = 'NjgmFXncQbokFuL90kwPmnuo2BzPK1Q20Fiqxr1QYyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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