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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02b77390b11a87fabe4e4d373ded7317894d8fdda33a4305bd463829b177f0ea' 
  AND token = 'n9UecVybOm/PW+wzIgOIgG8fOLJE0YdIf00YrfBfYCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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