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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '063a01b5f23e3a9c3b9731d92846af10089a10e4f81274ff056da2582a6c057c' 
  AND token = 'vJubsznfJNR1rEIY9dXkr+sLYsmhPfQ317131ojGM+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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