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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '733925e3e5f82f8dec5d81f8099514fdea4f49e0926ee5a5f794d56c2ddb1ae0' 
  AND token = 'SkM+0bW4ZdRnnUETTmnGC0/cujiElZ+ndIv1F+gRGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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