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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fd289c10d6be5bbe770a888a93beb714b7df11f43c9b53fc7d6b684393a287f' 
  AND token = 'fiqS80A03Bn4CeGMsXz7uynfbNWMhJHdvr1DlXyOJyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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