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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a87ca0ea36dc6154345cd65dc1a48148c1f7f4d6e777eebd55da220061b5a67a' 
  AND token = 'xQ3oTblvXKPhB198rFIWN8tlZ6ZM3pUXBTLyUSjIxEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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