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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42837b15879067c81305b468bfa0c869af0b5681ac9c7518b14df7282f8b9eac' 
  AND token = 'C5mncIN1/6ZO6m3pwdCbQQ10L80oaN+g5TEIa+zHvl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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