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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a90e06c270e9a3fc4542024e3d8f32992d42231f13d17f83a10e4483c0148002' 
  AND token = 'IGa5J6jM7kAFZxhPE93q+qe8zmJMVFBr0RrOz0jvqDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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