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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60eaf621a43b3f9997dc1079359da07fb93d5e71b44c675f0ea57f58b34e062b' 
  AND token = 'CZAts+byBS5PcK3WhIVU3YEZX5PyR5c8Fs9rRdhqyHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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