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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e590b341a70fc75e1159f8518ef6888ecf04bc19cc543f796ef3d39cf8f6935' 
  AND token = '+QseQhlBOnalZ9KlYklLlUV7fbl0oekpMWf0xQXiHes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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