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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3875d622d4c53043ba82b23bb1b47846ab205987cf204a03c53f3d672afaab6c' 
  AND token = 'FTaq0PU/LAvyS1OWapJey5spJbgzJnSSfYWIvcX0ia4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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