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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '767bdbe0aaeb1287a00301895c5907bf477539025bcca076d5e9434d289ab9ce' 
  AND token = '3VRbXZ7a/WpVJRA6K8cYnBnaLTunXDHu1i7ht2CguH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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