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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97d684534e7ad6b9b61b30638e531f45df9853fb457c8aaf610b8c8065c12a75' 
  AND token = 'vFI7XhQUo33gV6Z5kE/Ie4pGy5r6pF6kSwcU7wyVb1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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