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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39209185c95c5279388b3e1ad8fd3a2cd01e18444a06bbdd74fce2c8d4616a4a' 
  AND token = 'KdP3BzvrpidT/Ds9F1TwO8NAn/I7AlWefdDbVFxBcDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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