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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa925d86c9a722ad9e961696ab41387f7f781d633f31dc28fd0589909977dc0a' 
  AND token = '1lrX3xUuPXeBUmH4zPOxxgWIc789LVYye2th8bePeCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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