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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc110d6941979e095f42fee16aa336b18d48155cd94079c72a9e7a1a1ba3d2bb' 
  AND token = 'FAP1D9LYaib++fiFIk0+GyL601efXJgysYoy1adUzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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