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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2db42c0b013f30a863f7c1d4db9e0e372bbac12a6663b2cbc11450fe9f4b9b37' 
  AND token = 'vRm/H1le0K0/mximOS7Y/D2xMnquNReJ/7nUYQZURH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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