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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7b6cc1210eecea9f88810fd692d12908ce5959b647ba08b2e88a27981dd3bb4' 
  AND token = 'NdK4H/WFZohhaUHeGGuF63XGUFzT5oGyyML33l2+ArQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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