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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef6af8495cca22c78a7c3b1a730997fbc35c8059bcd2fb126c839a713e73614d' 
  AND token = '7gxOCY14iR/b8KmMn53ORLokW4Xty6wBSGU0oiT5LYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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