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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0524879909905f5ee6ec09531c9056b134b0cd339e523cc53364a2e3d4bddb09' 
  AND token = 'SckXaHuniPUke4qqlW+Qg572A0bkxamZxS4XjPb5W3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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