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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '579f8c94177108a645228fc202a6fe71f83b626d15b6631b01b0881d5bcfc7f1' 
  AND token = 'Pe7f1V0XPrxaKqWT5p+hJObOb4dtNeN14B9mc+f+j/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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